Or we can speculate the the societies where there is more freedom are taller. It could also be sexual selection as this stature change is too fast and usually

Or we can speculate the the societies where there is more freedom are taller. It could also be sexual selection as this stature change is too fast and usually the environment difference takes several hundred generations to show difference. The timeline is so small I'd argue it's actually free society enabling people to chase their sexual imperitive and this sexual selection is resulting in taller population, not nutrition.